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Old 05-16-2012, 03:25 AM   #1
574907wrx05
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Default Bov questions

Could people with a blow off valve tell this thread which type they have which company and there opinion on blow off valves...
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Old 05-16-2012, 03:44 AM   #2
907scoobyrex07
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Turbo xs 50/50 bov 50% recirc 50% atmosphere i like it alot but to be honest doesnt make a diff in my opinion it looks nicer and makes a louder noise... I was told yoi really dont need a aftermarket bov unless you are pushing alot more boost granted info could be wrong but it makes sense
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Old 05-16-2012, 03:53 AM   #3
Nomadgene
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Stock here, ……it goes whoosh!

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Old 05-16-2012, 04:06 AM   #4
granny
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Stay stock unless you like the sound. No performance difference.
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Old 05-16-2012, 04:37 AM   #5
Rookie J
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Quote:
Originally Posted by granny
Stay stock unless you like the sound. No performance difference.
True but it is easier on the motor for daily driving. I'm not using either a bov or recirc.
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Old 05-16-2012, 08:06 PM   #6
Billboard2001
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Quote:
Originally Posted by Rookie J View Post
True but it is easier on the motor for daily driving. I'm not using either a bov or recirc.
I thought that those were the only two choices? Unless your going to say you're not using a turbocharger either?
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Old 05-16-2012, 08:57 PM   #7
Rookie J
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Quote:
Originally Posted by Billboard2001

I thought that those were the only two choices? Unless your going to say you're not using a turbocharger either?
Lol I do have a turbo.
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Old 05-16-2012, 09:14 PM   #8
DaBlueSquirrel
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Quote:
Originally Posted by Billboard2001 View Post
I thought that those were the only two choices? Unless your going to say you're not using a turbocharger either?
You dont have to use either one. There are plenty of factory setups that do not use a bypass or BOV. It is there to protect the turbo over time by reducing the amount of back pressure applied to the compressor wheel when the TB plate closes.
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Old 05-16-2012, 11:17 PM   #9
seascooby
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turbo smart 50mm full atmo. love it
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Old 05-16-2012, 11:33 PM   #10
granny
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Quote:
Originally Posted by Rookie J View Post
True but it is easier on the motor for daily driving. I'm not using either a bov or recirc.

Quote:
Originally Posted by Billboard2001 View Post
I thought that those were the only two choices? Unless your going to say you're not using a turbocharger either?
It's called a cork. Well at least it looks like it.
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Old 05-16-2012, 11:51 PM   #11
Rookie J
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Quote:
Originally Posted by granny

It's called a cork. Well at least it looks like it.
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Old 05-17-2012, 01:18 AM   #12
kayetealynn
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Stock STi BPV for me. Does the job and isn't annoying.
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Old 05-17-2012, 01:33 AM   #13
smeerone
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Stock....
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Old 05-17-2012, 07:59 AM   #14
05GDF
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GFB for me.. Also adjustable 50/50 or 100%!!
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Old 05-18-2012, 06:21 PM   #15
Billboard2001
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Quote:
Originally Posted by DaBlueSquirrel View Post
You dont have to use either one. There are plenty of factory setups that do not use a bypass or BOV. It is there to protect the turbo over time by reducing the amount of back pressure applied to the compressor wheel when the TB plate closes.
Learn somethin' new every day
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Old 05-19-2012, 02:59 AM   #16
edo2000
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Quote:
Originally Posted by DaBlueSquirrel View Post
You dont have to use either one. There are plenty of factory setups that do not use a bypass or BOV. It is there to protect the turbo over time by reducing the amount of back pressure applied to the compressor wheel when the TB plate closes.
It's not so much the back pressure that is hard on the turbo, but the compressor blade stall, surging, and vibration that happens when you drastically reduce air flow through the compressor while it is spun up to operating RPM. Definitely shortens the life of the turbo.
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Old 05-19-2012, 03:08 AM   #17
QwikEVO
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I miss my Greddy Type S....
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Old 05-19-2012, 01:52 PM   #18
Billboard2001
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Quote:
Originally Posted by edo2000 View Post
It's not so much the back pressure that is hard on the turbo, but the compressor blade stall, surging, and vibration that happens when you drastically reduce air flow through the compressor while it is spun up to operating RPM. Definitely shortens the life of the turbo.
Is there actually any benefit to running this setup? I'd imagine that it would increase spool up time as that extra air would bog down the compressor. I guess that was why I made the assumption of only being two setups because if it shortens the life of the turbo as well as hurting other aspects of performance why would someone utilize it?
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Old 05-19-2012, 03:03 PM   #19
edo2000
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^^I'm pretty sure the only benefit for not having a BPV or BOV downstream of a turbo would be simpler/less expensive plumbing. I personally have not seen turbo setups without them but I don't doubt one exists somewhere. I assume that BPV's are better than BOV's for engine management, since that is the factory engineering folks choose.
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Old 05-19-2012, 03:31 PM   #20
retrac
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I can demo two setups without them, neither the race car or my STI run them. With a proper setup and tune, it's a significant increase in transitional throttle response.

Crawford Racing also sells all their turbo setups and built cars without BOV/BPV and you won't find a single WRC car running one either. But, as was already said, the system has to be set up properly for it.
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Old 05-19-2012, 10:53 PM   #21
edo2000
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Quote:
Originally Posted by retrac View Post
I can demo two setups without them, neither the race car or my STI run them. With a proper setup and tune, it's a significant increase in transitional throttle response.

Crawford Racing also sells all their turbo setups and built cars without BOV/BPV and you won't find a single WRC car running one either. But, as was already said, the system has to be set up properly for it.
Did not know this. Do you plan to operate the engine differently without a BPV? Say, try not to slam the throttle butterfly shut between gears? Do you notice any symptoms of compressor stall, like a repeated thumping sound when you get off the throttle when pulling hard? Sorry, I guess I should stop asking lazy questions and do some research.
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Old 05-20-2012, 12:18 AM   #22
AWDBST
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I too am curious about the tuning aspects of running without a bov or bpv. Could you exPlain a little about it or possibly pm some of the details? Thanks.
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